21109022 has 16 divisors (see below), whose sum is σ = 34618752. Its totient is φ = 9573720.

The previous prime is 21109007. The next prime is 21109061. The reversal of 21109022 is 22090112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13493 + ... + 14975.

It is an arithmetic number, because the mean of its divisors is an integer number (2163672).

Almost surely, 2^21109022 is an apocalyptic number.

21109022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21109022 is a deficient number, since it is larger than the sum of its proper divisors (13509730).

21109022 is a wasteful number, since it uses less digits than its factorization.

21109022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 21109022 is about 4594.4555716646. The cubic root of 21109022 is about 276.3690278278.

Adding to 21109022 its reverse (22090112), we get a palindrome (43199134).

It can be divided in two parts, 211090 and 22, that added together give a palindrome (211112).

The spelling of 21109022 in words is "twenty-one million, one hundred nine thousand, twenty-two".